LTC3805MPMSE#TRPBF

DC DC Switching Controllers Overview

The LTC3805MPMSE#TRPBF is an adjustable frequency current mode DC/DC controller designed for flyback, boost, and SEPIC converter applications. It drives N-channel MOSFETs with programmable switching frequencies ranging from 70 kHz to 700 kHz via external resistors. The device features a quiescent current of 360 µA during normal operation and 40 µA in micropower startup. It provides ±1.5% output voltage accuracy and supports input voltages from 4.7 V to 8.8 V or higher through a shunt regulator. Packaged in a 10-lead MSOP with exposed pad, it operates within a temperature range of -40°C to +125°C.

DC DC Switching Controllers Feature Summary

• Supports flyback, boost, and SEPIC topologies with N-channel MOSFET drive
• Programmable switching frequency and slope compensation via external resistors
• Integrated soft-start with automatic restart capability using an external capacitor
• Micropower startup mode reduces quiescent current to 40 µA

DC DC Switching Controllers Applications

• Flyback power supplies requiring isolated outputs
• Boost converters for voltage step-up applications
• SEPIC configurations for non-inverting buck-boost requirements
• Battery-powered systems utilizing micropower startup modes

DC DC Switching Controllers Procurement Notes

Verify the specific suffix TRPBF indicates tape and reel packaging when sourcing components. Confirm that the MP grade meets military or extended industrial temperature specifications if required by the design. Cross-reference the manufacturer datasheet for pinout compatibility and thermal pad grounding requirements to ensure proper integration into the target PCB layout.

DC DC Switching Controllers Selection Notes

Select this controller when designing flyback, boost, or SEPIC converters requiring adjustable frequency operation. It is suitable for applications needing precise output voltage accuracy and low standby power consumption. Consider the 10-lead MSOP package constraints for space-limited designs. Ensure external component values align with the desired switching frequency and slope compensation parameters defined in the official documentation.

DC DC Switching Controllers Part Context

This component belongs to the LTC3805 family of DC/DC controllers manufactured by Analog Devices. The series is engineered for high-efficiency power conversion across multiple topologies. The MP variant typically denotes enhanced reliability or extended temperature performance compared to standard commercial grades, fitting within the broader portfolio of precision power management integrated circuits.

DC DC Switching Controllers Replacement Considerations

Direct replacements include other LTC3805 variants such as the LTC3805EMSE#PBF or LTC3805HMSE#PBF, depending on package and temperature grade requirements. Verify functional equivalence regarding control logic and pinout before substitution.